Support for the PTP clock on the KSZ9563/LAN937x Ethernet Switch

configname: CONFIG_NET_DSA_MICROCHIP_KSZ_PTP

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Distributed Switch Architecture drivers
└─>Microchip KSZ8795/KSZ9477/LAN937x series switch support
└─>Microchip KSZ8795/KSZ9477/LAN937x series switch support
└─>Support for the PTP clock on the KSZ9563/LAN937x Ethernet Switch
In linux kernel since version 6.3 (release Date: 2023-04-23)  
Select to enable support for timestamping & PTP clock manipulation in
KSZ8563/KSZ9563/LAN937x series of switches. KSZ9563/KSZ8563 supports
only one step timestamping. LAN937x switch supports both one step and
two step timestamping.